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This specification covers an aircraft-quality, low-alloy steel
in the form of bars, forgings, mechanical tubing, and forging
stock.

These products have been used typically for heat treated parts
up to 4 inches (102 mm) round or equivalent cross-section which
require through hardening to tensile strength not lower than 180
ksi (1241 MPa) and which may require welding after heat treatment,
but usage is not limited to such applications.

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